Discussion
Consider the following statements about boundary-layer control:
1. Suction removes low-momentum fluid from near the wall.
2. Vortex generators mix high-momentum fluid down towards the wall.
3. Both techniques work by making the boundary layer laminar.
Which of the statements given above is or are correct?
Answer: D
The first two describe the two mechanisms correctly. The third is wrong: neither aims at laminarisation. Both work by giving the near-wall flow more momentum so it can survive a steeper adverse gradient, and vortex generators positively rely on turbulent mixing.
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